66789630415 has 4 divisors (see below), whose sum is σ = 80147556504. Its totient is φ = 53431704328.

The previous prime is 66789630409. The next prime is 66789630431. The reversal of 66789630415 is 51403698766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66789630415 - 2³ = 66789630407 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6678963037 + ... + 6678963046.

It is an arithmetic number, because the mean of its divisors is an integer number (20036889126).

Almost surely, 2^66789630415 is an apocalyptic number.

66789630415 is a deficient number, since it is larger than the sum of its proper divisors (13357926089).

66789630415 is a wasteful number, since it uses less digits than its factorization.

66789630415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13357926088.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 66789630415 in words is "sixty-six billion, seven hundred eighty-nine million, six hundred thirty thousand, four hundred fifteen".